I'd say that's unusual , did a quick look at old threads and very few show any green stuff , so all the sig's listed in that thread would most likely have gotten some juice!
It's gray after you post because in browser's link, there is your post-id too. And that don't have PR, but the thread have. So after you post, your signature links will be on a PR5 thread
I am not so much interested in PR gained from forum posts... I do enjoy the traffic that the I get from my signature though
Almost every time when I launch a new project i forget about the content and overdo SEO. Then after a month or so of linkbuilding, optimizing etc. I realize that my site has just 15 articles
1) Even if you go and post there, your post will end up on page 5 with PR of NA 2) This PR is probably no longer there. 3) Even if PR was there and you were able to post on that page the backlink you would gain would be close to worthless. There are PR7 threads around that are also worthless. 4) You already have backlinks from this domain. Another one would be like a drop in the ocean. 5) Is that page related to your website? Unrelated backlinks are pretty much crap.
https://siteexplorer.search.yahoo.c...int.com/showthread.php?p=4216906&bwm=i&bwms=p Only 1 backlink? I dont think it will say pr 5 for a while..